EH4电磁成像系统在高速公路隧道工程勘察中的应用

高速公路隧道周围一定范围内的岩溶洞穴及断层构造，都将对隧道施工产生安全隐患。为了避免施工风险和预防施工过程中可能出现的地质灾害，查明隧道软弱层、岩溶洞穴及断层等的赋存情况都十分必要。本文介绍了EH4电磁成像系统的原理、特点、工作方法和资料处理及在具体高速公路隧道工程中的应用实例和效果，说明该方法可对隧道的软弱层、地下水及断层破碎带的赋存进行超前的宏观预测。

Application of EH4 Electromagnetic Image System in Survey of Tunnels Engineering for Expressways

Karst caverns and faults around the expressways pose a great threat to the safety of expressway tunnel construction.In order to avoid the risk from the construction and to prevent the possible geological disaster from the construction,it is important to detect the aquifer,karst caverns,fault etc.The paper describes principles,characteristics,procedures and data analysis of EH4 using a case study in survey and investigation of the expressway tunnel in Fujian.EH4 successfully located soft and weak layer,underground water and broken fractures with assistance of other technical methods,which provides advanced information needed for classification of surrounding rocks of the tunnel.